Here is a proponent of AIDS denialism, the debunked claim that HIV does not cause AIDS https://en.wikipedia.org/wiki/Peter_Duesberg Duesberg's views are cited as major influences on South African HIV/AIDS policy under the administration of Thabo Mbeki, which embraced AIDS denialism.  Duesberg served on an advisory panel to Mbeki convened in 2000. The Mbeki administration's failure to provide antiretroviral drugs in a timely manner, due in part to the influence of AIDS denialism, is thought to be responsible for hundreds of thousands of preventable AIDS deaths and HIV infections in South Africa